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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b3d2359309aebf678e96df6a3cbabb92c682c58083bc4e16cc476bb513417b8' 
  AND token = '9V/H00o1DMBne9gtk4DAKUmVNUH9Hhpszvta3VkfmK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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