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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9f15b5738a6a801d28757b7c7734e21fa4e40d452ffb593974cd67ca5d45774' 
  AND token = 'jYtHtLVEn1ypuT3ktAvKulk6kWxZiU7mlYLGehipySI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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