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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9c8b70172f7a33ac94bf9ae55a461b3b8bc05e7f93bce95663f64c63fd1fdc' 
  AND token = 'XTS0k10DsY2WqeAbB/vnGU6l87gQX1B3Ig5wGvb10+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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