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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f2c22474f208e5098109d5e5281351dfd1c21cfcbd91f7fc3a45d32a84a0e8' 
  AND token = 'yt6f3k7pVkrdaymru9OgbfVRzkiviE5fEVrr8eDEkxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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