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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae840199d333b6c2a941ffc99a37d42d3feb74220dcd797c6aecb4f489cbc82' 
  AND token = 'XzraCIWz2q9CJRyMSI4ZOzhqLieDgds4FaeOBo/o6LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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