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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1e8070858464682561ac482ed232549b04fb60dcfe0578190ab5e11335b78e' 
  AND token = '4uNXQDTmfvwYoI8cdtbhIPp9lKBDFQtfPe5ecjw4Whk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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