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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd35becf2be3c5faacb2d704bdd21abd4cd1add04ebaf1b47924c9f90e5d38e56' 
  AND token = '6A78NjcPDu+J0wrik25f5KPLLlCvCj2cmV7rVGg1Wus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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