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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a7b3bcd24320b2532db5dd588c9d8394d745f5065099b3bd4560bd52bd125b' 
  AND token = 'FbZ6dXbqIjLNEjYf7Ixxvulry8VorNZrj3Gvw3jkchc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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