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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb3d9934d68dd29b8e03c5a3b503a27781fd417fe01cf8018764fd5c2177e2a' 
  AND token = 'jhlddFO+Xjl8SrmeR7z1DCgHQnUv9972WeeqUN2NpQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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