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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d511f36f2cae0d20cff81f616b73b63fa98d3376cefebb663a4955336524458' 
  AND token = 'lgltKlxNeo05tDwecW3YEGyYOdElA42jXiacLhZcipY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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