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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718c26638aeb29db7dae7225e9a1812698152c4231c2bbce8fe290cb34ac6644' 
  AND token = 'uJT77osfqSvGu3zQ5bKdb2M6+NbQUF8aOdqJnv1ouCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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