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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefd559c24d7930f43a03efcf03ab1e91bcbe3c981e834b99f96409ffc169cdc' 
  AND token = '5CREhz2fKoKhZ64zXG25URozarEtCdxcec46Dg29Vyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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