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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5688b75de9d4416c432da822cb9d2a69cf02c67d244741e94c5387d650ca0bfc' 
  AND token = '82HpVvbZeRujik1faVQGFEwxq+mTLwI4v0kmykD+0eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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