SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069894a8a4c5f05608e8935708e491597f33c662838e3cb1b770e4415f648585' 
  AND token = 'cRmV7dFO9a9hC8RHJY9xq99jtp/1vVJaT2JBZ7wwUJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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