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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f030fd1e73f46cbf1ec63f4441419a204629e8a78bc6fb4cc82613ca4383760' 
  AND token = 'gtFrLfZD5+xldrqk0z/3GhelFBziDCXYkkXk91MwePQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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