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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f78b39b7c266f2d3ee78564ff9cdc60a9cec344ec3b19c5f006f07480e8e53f' 
  AND token = 'KOJJbmX0wLT5bVwA3P9IffvpmFs7aGoM5etAmt3fJD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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