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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2e1d91c106c0157cd9bea67bec669e8dc2175583a1dedb6d6f1cb6e2cf27b7' 
  AND token = 'H2VDbOG/LMp+AxdhRE3zb7qIx0/XeDbEWUbTJq25Mhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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