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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58298abe9282b9c76d1248c46281e02827437442bca6d8cfe9003d602aa90f08' 
  AND token = 'xTBew4pLeDiYw8O2aBl5h3DATaLCdYTeYBcj8oKcJTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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