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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef5dc67a0550a4eef0511c6fa2af8e70b195b3e1c8d7cc6eaab7e148015381f' 
  AND token = '3aonT7Te37dZHUA5zb0fGOjfimUDRdKMZH8mqcrQd6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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