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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b93b1b8c680453dab4ead48b4820db1ccc04e5a7e4fa05d9d19a2413ca893f' 
  AND token = 'UIzbewsGfSytlZ9nz9QftO+gwKPvdl6RdYx+2iUDl/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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