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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b37e42388633412d79c8aa9bb005ac4ae7859e8a7e920c377b88eaaeb7ae56d' 
  AND token = 'GXRKOhbBvwuwnKV1v7lsJqJFLgSEvuTgEg/EjKty4jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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