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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '413c2dc033ed121cbe79472200d73958c3a8af26efc169f7c1d0cf069a2c59e5' 
  AND token = 'bBqVQmaAZd2RfOzAQOyBvZtwC+AHlk6HgGybh3s1lgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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