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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0e42f25a09f656627f408bf62c8750b9cebd3a9567b1392892d7f5a63615bf' 
  AND token = 'EIkOFTTh0ueqCyndXg4HxpG/GYrwOpFDUQ9pjIfU7Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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