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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e477481669805555b7abfdf93a897d228196a3df8cb4b791ad339acc7fa7898d' 
  AND token = 'quMcCRja1WBSBAXpWPfySYyTo6qNHz93oQSE9Vqh1oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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