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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613b5be1dd51c39a5f520a7178231ff39b0975cc7d065c35b903b4fc43319145' 
  AND token = 'aDSjbIn7K8/eVBz05LI+Awpcfwan7wCIksH1Wv3z9PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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