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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c62f9c3491022b4805adf9c2365f1296210d6ef2378d973f8dd9a99c836e3f3' 
  AND token = 'u7mvtVTva+lC9tPwW0n2Xl0qJ5WAo4qwE7k/ByaaQJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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