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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbece6ccbc58447dd05903e18fe97c8f937cb2ed35f119bb03f54e5b4119093' 
  AND token = 'ma9+tyg4K7lhQ46QGJTRmYj54aThhbooG61Ao2Bd20s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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