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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd25a15fb09b813eb4c806ce319e90d14e347fe4dae29f5ffa03950c1aeac2d3' 
  AND token = 'zo5J8dBnh1gZwa93znAdUl7Htjv248lZc0v0YLrZ2/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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