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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237507afe5cdf965392faefcc6df765c75e098736c73624777c68a8d31caa97a' 
  AND token = 'Fkn+A8bz/L8hY7KtH8c6JDs8YQejhXvejdEweTo1ufk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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