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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ba15cd1e5333e5affbe5c9027bfa03abf1b6be203e57eb15f6ce5ed6d69ed5' 
  AND token = 'yff7dIY9yGDLyvRV9Pc7vgKyyNfgr6O5xSG5C90Edag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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