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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69a12bfc869638be209669e4f3a8116e286f67f8c276d1e3ad798745d21a203' 
  AND token = 'IOw9OxilOEN3N0f5N6rGPeqyVo6PuQ7Y9m+OBfqqh7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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