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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd5da3e1e62e61ec2e0631a41979235774af86c731bb7ad1af723262335438b' 
  AND token = 'VMQ0nuv5Mpcf/MknlCTqXVT8ab4Lt2ZS2mc/V/eywhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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