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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f17ccd3030bdd9ac43d7e69c2a6f86329c6b74aaa77cad8b4209b9ead93b2fd' 
  AND token = 'C3IIQ1pwoVwxfE0C59/zjImNXoKD3Bdp9HhXIL4jsF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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