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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836fa2c30204dfefa23bfee6b01b665f65f9501e6ab0cb1685e675e81cba96fb' 
  AND token = 'VG7DIgJhdbvZm5gEnVVO5v06bFc40hqUz1BeLFxJfis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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