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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a16128e33e18ed3ac6f5da6d485689b58cad11c49426ac69523d6bc4928010' 
  AND token = 'XmVUf8Z4UoEv12wl3TkQm32z55axxIC1w84gSoR2JYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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