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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5df2e1adcf283006235be3c790c91a1ce9a98769a25196648f2df0a5d8ab3b' 
  AND token = 'xXieJxMTePUO3SW3WalN3tQ8EV8yvuqkZ2nkarf+dNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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