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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb8d07afc876996b224a69b5feca055b75c5a444628e9091257e17edc9591d4b' 
  AND token = 'a52RPpUy6uamhThJOs4SqCfBg6E7FR26BGcSbAjX/ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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