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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d6ab77127107e783d0ca69355b4c79af43c0617c5e5405910deab101abcc07' 
  AND token = 'XaKLfJNzhWKo7xM+z8gttvlzssku7pHD5QDEODbvEAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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