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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be8d762fd08447654b9922c510cee0d288478cc838a5e6bb550eeb1afcfa087' 
  AND token = 'PIneJFY8moIGlWT0oKR3Z0fVIHwbRCEHqCnyzcGpqeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}