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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '862a6dc4478316e1952018552fe5c15ae68ba28c6d971bb7365392114b0e5498' 
  AND token = 'QRrI8mNJ9DKrYCabgyGh+n6aqs6HIAcj2+dCQlt+AzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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