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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d6d744be4e9b29c62def876f8f367def48b0c1d42d7a8f14991f4310d8c46f' 
  AND token = 'UpN+YsyH5H1yaFMOgsEmzq9p/anwtKSJJv/j70aP4Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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