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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a48083f879586fcc0f91420ddb81e98dc8341a25bf2ef26f455f5bfd452b7bce' 
  AND token = 'EQKS1f3K6VNfWSGXoaU7tHyPtY8IxH+c/QfaN+aK4Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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