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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc16e5840c43a42460e920e579f436adfa7c51f830eddb94d74815d6f60a0c4a' 
  AND token = 'lVH+YqS2etQFFUOo8m4puriT4/+Pv91BFxZxeZfJtVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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