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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30637c12e7a9d7080e3187dbe39a89352b21fa4813ea39faadd26f13fc43bc83' 
  AND token = 'qExcW5/mzWTwTnHOGe4Fv33Y3xdo8yCeHsSVHQa74WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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