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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a04c93761b7d58643f74bd6627ca0df5eb4c778e8ba30c5034500096ad3c91d' 
  AND token = '59x9VKfUgY8it+Nd1WGHPJ0t00VtCUvZguEkDkp3XXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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