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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '719d66e80de4974c405a25ffa1dcc93f108127041eb98c5d4e5b723dededa04b' 
  AND token = 'gbZ0GagVgT2DX5DIaAFRAVnZ8AgPdkZVSm/q5+kq4nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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