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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7cc80e00ff83ce5e1808b93a29ae504da2d78e10007a7c40ce02eac5576066' 
  AND token = 'FojubXVXYCh2ZTv5zfow4nDE3PX4GmsRcI3AV3N7MuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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