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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b753fadac848621e510d53a543f7e42e239f1eafb6f0a9eb75f728154c6ef87' 
  AND token = '5HlnwWOErRJU5us6JhH+u73NAIl81tWmujx/X0m0j+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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