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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c739acd7c0bee45ee54155c3843c8ae16b83eef7b6f87fc4da1d1182f2223ed5' 
  AND token = '/YknyhdJMNCqMXgqIvcD/fTbQp+AHxdMZ7LdDAyx8qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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