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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ac9d6f89f0a638e13cef2b99bdc65348554d4a5af84f479b32c9fc6a495d31' 
  AND token = 'kWzPRpnfL20koDbAHY1el1XJTAd/X+QlxEDSS/n1was=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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