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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6f1448ab2ad14c5fab39fe9f30b83f87d7ef0edf169c7536496b825e0b8d0e' 
  AND token = '6GYNh5WbH6NgAw2cKURbmsWb1AsmspURWA+bSQMDnqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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