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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a56030a1beec8b16c15606bc0926770da1813c14e6bb184da92ace18b7485a4' 
  AND token = 'TeLCtdRUM3AR0b0BoTbv+fI7uE4Ln16LYh3RGU6RqPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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