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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d05b33124ab4f2d7578b37fd0ac484049afae52d7e9851a26e8a293aa74d64' 
  AND token = 'YiyDP+myocafJy6RY/6ISG+EpknFW+kqF8M+JC2GgHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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