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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82ec9e18f602c34943e229cb9dd50981b32ec902e76a05aa2c35a8daae7103c' 
  AND token = 'y/YWkIPS11y+wO7yq5smDo7py7DP24X5aSWD6hW+lvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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