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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700d750ac567fd02612b41110ba7d139ba3090f316e5ae763c1b9ecf4ef2ac31' 
  AND token = '/QxwtPSr5gzDGucoiBPmbnaC1PO4/q7lk28BjBElC7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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