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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcf189f2e8e5d53f21e9cf71cab9d3ea0f0663393a46fc893b57e7ea37e33cf' 
  AND token = 'L02lW5Z33W/lkB7HcebOuuktmmgwbRFCv8zxR6dKTdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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