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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8554d7362dc067da0492def63cbadf4f8251f7240061e828d4c5d05a2d94fbe6' 
  AND token = 'wdVlKuiuN/We6bIbmzNpinZltmhsZSO0rTsNf6btSGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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