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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319ebcc2e11ac5464628db36c668957a8c23d41a9c3f3766cc37ab9cdfe81590' 
  AND token = '+4kGoPshX/h6BZsHcQlgm15/4droShiukT+Z42tg65c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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