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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab1eadad97f7e73d4059b584c904ac4fdbf5377b4d12d59fbe7b8b9c166b30b' 
  AND token = 'FLUJwCjs2syQTW5BWfsvMN4vIAlsLOPFpAhVpy6Z9hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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