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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4318118042f5a437cc3567f49db41e94c50722e91fe6862d1efca0abc9be08' 
  AND token = 'JDijo80LJYnExQKJIT2UZF6ROErj3afJ5HykTT96Gy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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