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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1d6e544a28baf9697dd5b34eed045fafbcfcab9c9501fb4c38726a38d887f3' 
  AND token = 'HcxmnLww78+1Nws1pAKmmD8uemz2flCpiOro8jaVzDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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