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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825eeff77e37aca94d54c4d6814a64e3f69caaafcb09f18ee4c9b0c919f52efc' 
  AND token = 'U1wIDAHr8Eq9paf7K+pmC/U6NkyEGL0t9mdbIhE4now=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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