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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d6e27ef9184441960aad8c6527411aada31fad353ec5d10ccfea0afa8cc042' 
  AND token = 'IC/8FVB5vJsL7+0RD/+LCnHsH9EXNbD+WlvTGf+U+3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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