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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031e781a8af82e36b8ed6b9cf76f089e62e5431ae8c9dcd3735ffc838a782f37' 
  AND token = '/zIGMgkN6oUZOaTc/QAhE2FtBcOYpu7Ez3A/FdMobcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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