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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4567e2daac9ea7c08208c46829e5b7af2cad78c32828bff309f7b3a50cfb9bb' 
  AND token = 'QWgeyrYAUMIKqQT16SOs4EFhoA27YYHegTV8Dy0w0uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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