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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b08fc7bea035de639575bbfa32185a11f65d6ff5a5eb3bfaba83bc35216ccb9' 
  AND token = 'a8YbPHnNrSE3Vpz4CQK6JPZyM7+oyaW6a4LORY8VDPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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