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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4fd85b38237cbea826985fe63613f4dc9c19629497035eab6609841f4171a6f' 
  AND token = '4qDxAbQozBH0RPWcorq6ux/v9nQ9WXPesozOxJNddig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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