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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f5c52549b44e68722bdc329aa50ab63ea2777a77cde99248e22a29d187b690' 
  AND token = 'ZC3k/HDjWtM7KDYV1ALMAwK85MsFeadMYY9xUX55ivk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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